Used to Find Oil at Leduc
technology used was standard for that time. A series of lines, approximately 10
kilometres apart, was delineated on the area to be explored. The seismic crew
then drilled a series of 18-metre deep holes at regular intervals along each
line, placing small quantities of explosives in the holes and detonating them.
The resulting shock waves travelled underground, reaching solid rock and
reflecting back to the surface to geophones (like microphones) placed on the
ground. The time it took for the waves to reach the surface indicated the
distance between the underlying rock and the surface, enabling geologists to
draw a profile of the rock.